.extendBox {
    height: 30px;
    font-size: 12px;
    background-color: #fff;
    width: 100%;
    cursor: pointer;
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    transition: all 0.2s ease-in-out;
}
.hide {
    height: 0px;
    opacity: 0;
}
.triangleUp {
    margin-top: -2px;
    margin-left: 5px;
    width: 6;
    height: 10;
    border-top: 5px transparent solid;
    border-right: 5px transparent solid;
    border-left: 5px transparent solid;
    border-bottom: 5px #595959 solid;
}
.triangleDown {
    margin-top: 6px;
    margin-left: 5px;
    width: 6;
    height: 10;
    border-bottom: 5px transparent solid;
    border-right: 5px transparent solid;
    border-left: 5px transparent solid;
    border-top: 5px #595959 solid;
}
